router_readconfig: fix parsing of proto when directly followed by ;
router_readconfig: fix parsing of proto when directly followed by ;

tjamesturner/carbon-c-relay,grobian/carbon-c-relay,Skyscanner/carbon-c-relay,piotr1212/carbon-c-relay,Skyscanner/carbon-c-relay,grobian/carbon-c-relay,lyft/carbon-c-relay,piotr1212/carbon-c-relay,lyft/carbon-c-relay,tjamesturner/carbon-c-relay,piotr1212/carbon-c-relay,lyft/carbon-c-relay,zzl0/carbon-c-relay,piotr1212/carbon-c-relay,zzl0/carbon-c-relay,rtoma/carbon-c-relay,rtoma/carbon-c-relay,grobian/carbon-c-relay